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介绍了高比特率数字用户环路（ＨＤＳＬ）的系统结构、原理及应用；不对称数字用户环路（ＡＤＳＬ）的技术特点及应用；光纤到路边（ＦＴＴＣ）的网络结构、应用及网络的升级；光纤－同轴混合网（ＨＦＣ）的网络结构以及上述接入网技术经济比，并讨论了ＨＦＣ技术与当今通信系统数字化的关系。
The system structure, principle and application of high bit rate Digital Subscriber Loop (HDSL) are introduced. The technical features and applications of Asymmetric Digital Subscriber Loop (ADSL) are introduced. The network structure, application and network of FTTH Upgrade; fiber-coaxial hybrid network (HFC) network structure and the above access network technology and economic ratio, and discusses the relationship between HFC technology and today’s digital communication system.